JPS6160711B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a method for manufacturing an injection ski. Traditionally, the manufacturing method of Injiexion skis includes:
For example, as shown in FIG. 2, a lower surface component 8 to which a sliding surface material 5, a steel edge 6, etc. are adhered in advance is placed in the lower mold 2, and then a cutout 3 provided in the lower mold 2 is placed. , a hollow part 12 formed by arranging the upper surface component 11 in which the fiber-reinforced plastic board 9 and the upper surface material 10 are bonded in advance, and placing the upper mold 4 thereon;
There is a known method of manufacturing injection molding skis by injecting foamed synthetic resin into the mold. However, this method had the following drawbacks. That is, the upper surface component 11 is placed in the notch 3 of the lower mold 2.
When placing the upper surface component 11 , if a material with low rigidity is used, it will bend due to its own weight, and if foamed synthetic resin is injected as it is, the resin will wrap around the bent part and the product will be damaged. This resulted in a worthless product and a very poor yield. For this reason, a method has been adopted in which the upper surface component 11 is made of a highly rigid member with a firm waist to prevent it from deflecting due to its own weight. It was too high, making it unsuitable as a ski for beginners or intermediate skiers. Furthermore, upper and lower surface constituent members
The fiber-reinforced plastic plates and other members that make up parts 8 and 11 must be preformed using adhesive, which is a time-consuming process.
This inevitably led to problems such as an increase in price. In view of these drawbacks, the present invention has good productivity and
This is a method for manufacturing an in-jexion ski that is aimed at providing a lightweight, inexpensive in-jexion ski that is soft, rigid, and suitable for beginners and intermediate skiers. To explain the present invention based on the drawings, as shown in FIGS. 3 to 5, a ski molding lower mold 19
A sliding surface material 13 and a fiber-reinforced plastic material 15 having an appropriate gap 14 are arranged inside, and a pressure-welding member 16 for pressure-welding and fixing the fiber-reinforced plastic material 15 is further stacked, and steel edges 17 are placed on both sides. The lower surface component 18 is formed by pressing. Next, a holding member 21 is installed wider than the entire width of the notch 20 of the lower mold 19, and the holding member 21
After placing the fiber-reinforced plastic material 15 with an appropriate gap 14 thereon, the upper surface member 22 is placed to form the upper surface component 23. Next, after placing the upper mold 24, the lower surface component is formed. This method of manufacturing an injection ski is characterized in that the ski is simultaneously integrally molded by injecting a foamed synthetic resin into a hollow portion 25 formed by the upper surface component 18 and the upper surface component 23 , and then foaming and hardening the resin. As described above, in the method for manufacturing an injection ski of the present invention, the pressure contact member 16 and the holding member 21
By using materials that are easily impregnated with synthetic resin, such as woven fabrics, non-woven fabrics, scrim cloth, and thin matte, when the foamed synthetic resin is injected, the foamed synthetic resin However, these pressure contact members 16 and holding members 2
1, the foamed synthetic resin passes through the gaps 14 of the fiber-reinforced plastic material 15 having appropriate gaps 14 forming the lower surface component 18 and the upper surface component 23 , and reaches the sliding surface material 13 and the top surface material 22. As a result, the fiber-reinforced plastic material 15, the sliding surface material 13, and the top surface material 22 are integrally molded during foaming and curing. Therefore, it is no longer necessary to preform the lower surface component 18 and the upper surface component 23 in advance as in the conventional case, and the process can be simplified and costs can be reduced. In addition, in the method for manufacturing an in-jet ski according to the present invention, the fiber-reinforced plastic material 1 having an appropriate gap 14 is disposed on the sliding surface material 13.
5 is placed in the mold, the pressure contact member 16 is stacked on top of it so that it does not move within the mold, and then the pressure contact member 16 and the fiber-reinforced plastic material 15 are fixed by pressing with a steel edge 17. Therefore, the fiber-reinforced plastic material 15 is highly effective in preventing product defects caused by movement within the mold, resulting in good product yield and further cost reduction. Incidentally, as shown in FIG. 5, the press member 16 may be provided with holes 26 of arbitrary shapes at appropriate positions to improve the permeability of the foamed synthetic resin, if necessary. Further, even if the press member 16 is not disposed along the entire length of the mold, but is placed at key points, a sufficient press effect can still be obtained. In addition, in the method for manufacturing an injection ski of the present invention, a holding member 2 for holding the upper surface component 23 in the notch 20 of the lower mold 19 is provided.
1 wider than the full width of the lower mold 19, after arranging the upper surface component 23 , the upper mold 2
4, tension is generated in the holding member 21 and can prevent the upper surface component 23 from deflecting due to its own weight, so there is no need to consider the rigidity of the upper surface component, and the rigidity of the ski itself is softened. This makes it possible to provide skis with soft elasticity suitable for beginners and intermediate skiers. As the fiber-reinforced plastic material 15 having the appropriate gaps 14 described in the embodiment, commonly-called open plain weave cloth, open roving cloth, etc. can be used, and a conventional fiber-reinforced plastic board with perforations can be used. It is also possible to use a In addition, by using a nonwoven fabric, etc. for the pressure contact member and the holding member, when the foamed synthetic resin foams and hardens, a skin layer is formed at the interface of the nonwoven fabric, etc., and a skin layer is also formed at the interface of other members. Because of this formation, the thickness of the skin layer increases, resulting in effects such as improved adhesive strength and bending strength of the core material. As described above, the method for manufacturing an injection ski according to the present invention has good productivity and can provide stiff and soft skis suitable for beginners and intermediate skiers at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the ski. FIG. 2 is a cross-sectional perspective view of main parts showing a conventional method of manufacturing an injection ski. FIG. 3 is a perspective view showing the procedure for arranging the lower surface constituent members used in the present invention. FIG. 4 and FIG. 5 are perspective cross-sectional views of main parts showing the steps of the present invention. FIG. 6 is a cross-sectional perspective view of a main part of a completed ski of the present invention. 1: Ski body. 2: Lower mold. 3: Notch.
4: Upper mold. 5: Sliding surface material. 6: Steel Edge. 7: Fiber reinforced plastic board. 8 : Bottom component. 9: Fiber reinforced plastic board. 10: Top material. 11 : Upper surface component. 12: Hollow part. 13:
Sliding surface material. 14: Gap. 15: Fiber reinforced plastic material. 16: Pressing member. 17: Steel Edge. 18 : Lower surface component. 19: Lower mold. 20:
Notch. 21: Holding member. 22: Top material. 2
3: Upper surface component. 24: Upper mold. 25: Hollow part. 26: Hole. 27: Foamed synthetic resin.

Claims (1)

[Claims] 1. A sliding surface material and a fiber-reinforced plastic material having an appropriate gap are arranged in a lower mold for ski molding, and a pressure-welding member for pressure-welding and fixing the fiber-reinforced plastic material is further stacked. Then, both sides are pressed together with steel edges to form the lower surface component. Next, by constructing a holding member wider than the full width of the notch of the lower mold, placing a fiber-reinforced plastic material with an appropriate gap on top of the holding member, and then placing an upper surface material, After forming the upper surface component and then placing the upper mold, foamed synthetic resin is injected into the hollow part formed by the lower surface component and the upper surface component, and the ski is molded simultaneously by foaming and hardening. A method for manufacturing an indie excision ski, characterized by: 2. A method for producing an in-jet extension ski according to claim 1, wherein the fiber-reinforced plastic material having appropriate gaps is a perforated plain weave cloth, a perforated roving cloth, or a perforated fiber-reinforced plastic board. 3. A method for producing an in-jet ski as set forth in claim 1, in which the pressing member and the holding member are made of woven fabric, non-woven fabric, scrim cloth, matte, or other material having the property of impregnating and permeating synthetic resin.